java中复数四则运算的小程序

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
//复数类的定义
class ComplexNumber {
//定义复数里的实部与虚部;
private double RealPart , ImaginPart;
//缺省情况的构造方法;
public ComplexNumber(){
RealPart = 0;
ImaginPart = 0;
}
//有形参的构造方法;
public ComplexNumber(double r,double i){
RealPart = r;
ImaginPart = i;
}
//获取当前对象的实部;
public double getRealPart(){
return RealPart;
}
//获取当前对象的虚部;
public double getImaginPart(){
return ImaginPart;
}
//修改当前对象的实部;
public void setRealPart(double r){
RealPart = r;
}
//修改当前对象的虚部;
public void setImaginPart(double i){
ImaginPart = i;
}
//当前的复数对象与形参复数相加方法;
public ComplexNumber ComplexNumberAdd(ComplexNumber c){
ComplexNumber result = new ComplexNumber();
/*因为实部与虚部均以private修饰,所以要通过复数类中的setRealPart()与setImaginPart()方法来修改;
*两复数的实部相加
**/
result.setRealPart(this.RealPart+c.getRealPart());
//两复数的虚部相加;
result.setImaginPart(this.ImaginPart+c.getImaginPart());
return result;
}
//当前复数对象与一实数相加;
public ComplexNumber ComplexNumberAdd(double c){
ComplexNumber result = new ComplexNumber();
//实部加上实数;
result.setRealPart(this.RealPart+c);
//虚部不变;
result.setImaginPart(this.ImaginPart);
return result;
}
//当前复数对象减去形参复数对象;
public ComplexNumber ComplexNumberMinus(ComplexNumber c){
ComplexNumber result = new ComplexNumber();
//当前复数的实部减去形参对象的虚部;
result.setRealPart(this.RealPart-c.getRealPart());
//当前复数的虚部减去形参对象的虚部;
result.setImaginPart(this.ImaginPart-c.getImaginPart());
return result;
}
//当前复数对象减去某一实数;
public ComplexNumber ComplexNumberMinus(double c){
ComplexNumber result = new ComplexNumber();
//复数对象的实部减去实数;
result.setRealPart(this.RealPart-c);
//复数对象的虚部不变;
result.setImaginPart(this.ImaginPart);
return result;
}
//当前复数对象乘以形参复数对象运算的方法;
public ComplexNumber ComplexNumberMuti(ComplexNumber c){
ComplexNumber result = new ComplexNumber();
//当前复数与形参复数相乘后实部的结果;
result.setRealPart(this.RealPart*c.getRealPart()-this.ImaginPart*c.getImaginPart());
//当前复数与形参复数相乘后虚部的结果;
result.setImaginPart(this.RealPart*c.getImaginPart()+this.ImaginPart*c.getRealPart());
return result;
}
//当前复数与某一实数相乘的运算方法;
public ComplexNumber ComplexNumberMuti(double c){
ComplexNumber result = new ComplexNumber();
result.setRealPart(this.RealPart*c);
result.setImaginPart(this.ImaginPart*c);
return result;
}
//当前复数对象除以某一复数的运算方法;
public ComplexNumber ComplexNumberDivi(ComplexNumber c){
ComplexNumber result = new ComplexNumber();
//复数c中实部和虚部的平方和；
double d = c.getRealPart()*c.getRealPart()+c.getImaginPart()*c.getImaginPart();
result.setRealPart((this.RealPart*c.getRealPart()+this.ImaginPart*c.getImaginPart())/d);
result.setImaginPart((this.ImaginPart*c.getRealPart()-this.RealPart*c.getImaginPart())/d);
return result;
}
//将当前的复数对象以字符串的形式表示
public String toString(){
return ""+this.RealPart+"+"+this.ImaginPart+"i";
}
}
//复数的四则运算在Applet程序的实现;
public class ComplexNumberDemo extends Applet implements ActionListener{
//定义a、b、c、d四个文本框分别存储复数下x、y的实部与虚部；
TextField a,b,c,d;
Label title;
//参加运算的复数对象x、y运算结果result的定义；
ComplexNumber x,y,result;
Button bu;
//定义一个选择菜单，用以选择运算方法（加、减、乘、除）；
Choice ch;
//applet的初始化过程；
public void init(){
a = new TextField(5);
b = new TextField(5);
c = new TextField(5);
d = new TextField(5);
ch = new Choice();
ch.add("加");
ch.add("减");
ch.add("乘");
ch.add("除");
bu = new Button("确定");
title = new Label("请输入两个复数:");
add(title);
add(a);
add(new Label("+"));
add(b);
add(new Label("i"));
add(ch);
add(c);
add(new Label("+"));
add(d);
add(new Label("i"));
add(bu);
bu.addActionListener(this);
}
//触发事件的处理过程；
public void actionPerformed(ActionEvent e){
//两复数对象的初始化；
x = new ComplexNumber(Double.parseDouble(a.getText()),Double.parseDouble(b.getText()));
y = new ComplexNumber(Double.parseDouble(c.getText()),Double.parseDouble(d.getText()));
//ch.getSelectedIndex（）方法获取选择菜单中选中的菜单的索引（该索引以0开始计算）；
//捕获选择菜单中的运算方法，并调用相应的运算方法；
switch(ch.getSelectedIndex()){
case 0:result = x.ComplexNumberAdd(y);
break;
case 1:result = x.ComplexNumberMinus(y);
break;
case 2:result = x.ComplexNumberMuti(y);
break;
case 3:result = x.ComplexNumberDivi(y);
break;
default:break;
}
repaint();
}
public void paint(Graphics g){
//运算结果的显示；
if(x!=null&y!=null)
g.drawString(""+ch.getSelectedItem()+"运算的结果为:"+result, 10, 100);
}
}
//<applet code = "ComplexNumberDemo.class" width = 800 height = 500></applet>

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